Fixed quantity liquid supplying apparatus using fluidic devices

ABSTRACT

A fixed quantity liquid supplying apparatus performs a liquid supplying operation of predetermined fixed quantity with a control fluidic circuit using fluidic devices. The control circuit is operated by a preset counter which operates when the supplied quantity of the liquid reaches the fixed quantity. The fuel supplying is stopped in multiple stages by the control circuit. The preset counter is freely varied and setted with the variable fixed quantity. The fluidic devices are operated by fluid such as air.

United States Patent App]. No.1 85,322

Foreign Application Priority Data Field of Search ..222/14, l5, 16', 20, 23-28, 222/52, 59, 35, 76, 70, 32', 34; 194/13 Kato et al. [45] 1 [54] FIXED QUANTITY LIQUID SUPPLYING [56] References Cited APPARATUS USING FLUIDIC DEVICES UNITED STATES PATENTS [72] Inventors: 2. 1 S 5 f fl 3,028,050 4/1962 Nelson ..222/16 9% 0 am 1 1122,710 l/l946 Cornell et al.... .....222/14 Nlshlba, Asahl'ku, Ykhama, all 1,928,086 9/1933 Barr. 1 ..222/l6 of Japan 7 2,759,633 8/1956 Ross ..222/s9 A [73] Sslgnee Toklco Ltd Kanag'awa Japan Primary Examiner-Robert B. Reeves Filedl fi 1970 Assistant Examiner-James M. Slattery AltorneyWaters, Roditi, Schwartz & Nissen [57.] ABSTRACT 4 Claims, 8 Drawing Figures PATENTEDnzc 19 1972 SHEET 2 OF 6 N Q Q 1 MEEDS GEE PATENTED DEC 19 m2 SHEET 4 [IF 6 a? m QM MT & u L LN? R Km Tfiw Ev w W6 R .Q & -E8 3 R Eh an 1 EEE ER as k Mn .t an Y% a 8 N m N M J v V cg a g mm m QWx v m w Q nww k 6w? M PATENTED EB 1 I97! 3. 706, 398

sum 5 or 6 NQN M WNN %NN WNW MQ ANN IQ 1 i FIXED QUANTITY LIQUID SUPPLYING. APPARATUS USING FLUIDIC DEVICES ty into containers such as tanks for a tank lorry, drums and the like, the flow quantity of the liquid is counted to obtain a total amount of liquid to be supplied. There is used a fixed quantity valve closing device for automatically closing the valves to stop the supply of liquid when the total amount of the supplied liquid is reached a predetermined fixed value. A conventional fixed quantity valve closing device has comprised of a flowmeter emitting an electric signal responsive to the flow quantity of a liquid, an integrating counter to receive a signal of flow quantity issued from the flowmeter for counting and integrating the total value of the supplied fuel, a control unit issuing a valve closing electric signal when the integrated value counted by the integrating counter coincides with the predetermined fixed quantity, and an electromagnetic solenoid to actuate by signal issued from the control unit so as to directly or indirectly close the valve.

In the event that the liquid for supply is an inflammable liquid such as gasoline, light oil, or LPG, it is likely to cause the fire, explosion or similar troubles by electrical sparks,'overcurrents and the like electrical incidents. The electrical circuit is therefore specifically designed to avoid such fire or explosion and this requires the apparatus a complicated and large construction as well as high cost of manufacturing. Thus, it has been found undesirable to apply a control means using electrical signals generally in the apparatus supplying the above described liquid.

It is, therefore, a general object of the present invention to provide a novel and useful fixed quantity liquid supplying apparatus in which the above mentioned disadvantages in the conventional apparatus are eliminated.

. Another object of this invention is to provide an apparatus which employs only fluidic signals to actuate the fluidic devices or amplifiers and can safely supply a fixed quantity of a liquid even when a liquid for supply is an inflammable liquid.

Still another object of this invention is to provide a fixed quantity liquid supplying apparatus which uses fluidic devices having no contact portions such as electric switches or relays and which is however excellent in endurance and easy for maintenance and inspection.

A further object of the invention is to provide a fixed quantity liquid supplying apparatus having a novel control fluidic circuit which can perform the valve closing through a multiple stages by use of pure fluidic devices such as OR devices, flip-flop devices, NOT devices and the like.

A still further object of the invention is to provide an apparatus which can freely set up a supply quantity corresponding to different quantities of a liquid to be supplied and supply a liquid of the set up quantity.

These and other objects and features of the invention will become apparent from the description hereinafter set forth with reference to the accompanying drawings, in which:

FIG. 1 is a side elevation of an embodiment of a fuel supplying stage cooperating with the apparatus of the present invention;

FIG. 2 is a schematic diagram showing a system of an embodiment of the apparatus according to the invention;

FIG. 3 is a view diagrammatically showing the construction of an embodiment of a preset counter in the apparatus shownin F102;

FIG. 4 is a characteristic curve showing a flow quantity of a supplied liquid;

FIG. 5 is a schematic diagram showing a system of another embodiment of the apparatus according to the invention;

FIG. 6 is a schematic diagram showing a system of a further embodiment of the apparatus according to the invention;

FIG. 7 is a diagrammatic view illustrating a preset counter in the apparatus shown in FIG.6; and

FIG. 8 is a perspective view of the preset counter shown in FIG.7.

Referring to FIG.1, a fuel supplying stage part to which the apparatus of this invention is applied is now illustrated. A liquid supply pipe 10 connected to a reservoir (not shown) and extending to a predetermined place is provided with a pump 11, a flowmeter l2 and an air operating stop valve 13 respectively in the way of the pipe appearing on the ground. A rotatable loading arm 14 is provided at the end of the pipe 10. There is provided a stage 17 in height that an operator thereon can easily insert the loading arm 14 into a tank 16 of a tank lorry 15. A post 18 is uprightly provided on the stage 17. The post 18 contains an alarm means, a

pressure indicating means and the like as the case may require. A start operating valve 20 and an emergency stop operating valve 21 are suspended from the ceiling 19 over the stage 17 at a height to allow passing of the tank lorry l5 and operating of the operator.

The flowmeter l2 actuates a preset counter later described. The loading arm 14 is provided with a'liquid level detecting means 22 including a bubbler tube. An earthing means 23 is provided at a position which is free from obstructing loading and the passage of the tank lorry 15. Prior to fuel supplying operation, the operator pulls out an earth wire from the earthing means23. A part of the car body is earthed to avoid fire, explosion, etc. which maybe caused from static electricity generated during the fuel supplying operation. A control box 24 which is adequately positioned contains a control fluidic circuit constituting an essen-.

tial portion of the apparatus of the invention as later described. I

With reference to FIG.2, a first embodiment of the apparatus'accordin'g to the invention is illustrated associated with the above described control circuit.

In the way of the fuel supplying pipe 10, there. are respectively provided the pump 11, a strainer30, the flowmeter 12, the air operating stop valve 13 and a manually operating valve 3 l. The pump 11 is started or stopped by later described action. A by-passpipe 32 diverged from the pipe 10 is provided between the flow-out side of the pump 11 and the flow-out side of the manually operating valve 31. A by-pass valve 33 to be manually or automatically operated is provided in the way of the pipe 32. i

As an example, compressed air from a Compressed air source 34 such as of an air compressor is fed to air pipes 37 and 38 through an air pipe and a pressure regulating valve 36. The pipe 37 is diverged into two ways and connected to inlets 39b and 40b of air pilot type changeover valves 39 and 40. The changeover valves 39 and 40 are switched over when air pressure is applied to air pilot parts 39a and 400 by later described action. The valves 39 and 40 then communicate the inlets 39b and 40b to outlets 39c and 400 which are not normally communicated. Air pipes 41 and 42 led out of the outlets 39c and 40c of the changeover valves 39 and 40 and having pressure regulating valves 43 and 44 respectively in the way are connected to input ports 45-1 and 45-2 of an OR device-45 consisting of a pure fluidic device. The pressure regulating valve 43 is set at a pressure of 0.3 Kg/cm and the pressure regulating valve 44 is set at a pressure of l Kgl'cm Output port 45-3 of the OR device45 is connected through an air pipe 46 to a valve operation control part 47 of the stop valve 13. The pipe 38 is diverged into an air pipe 49 provided with a pressure regulating valve 48 in the way and an air pipe 50 connected to the control part 47. The pressure regulating valve 48 is set at a pressure lower than the pressure regulating valve 36. The pipe 49 is furthermore diverged into air pipes 51, 52, 53 and 54. The pipe 51 is connected through the start operating valve 20 to control ports-2 and 56-2 of'flip-flop devices 55 and 56 consisting of pure fluidic devices. The pipe 52 is connected to the supply port 55-1 of the flip-flop device 55. The pipe 53 is connected through the emergency stop operating valve 21 to an input port 57-1 of an OR device 57 also consisting of a pure fluidic device. The pipe 54 is connected to the supply port 56-1 of the flip-flop device 56. There may be used OR gates'having shuttle valves instead of the OR devices 45 and 57. The output port 55-4 of the flip-flop device 55 is opened to the atmosphere. The output port 55-5 of the device 55 is connected, on the one hand, through an air pipe 58 to the air pilot 39a of the changeover value 39, a pressure switch 59 and an information means 74 and on the other hand, through an air pipe 60 to a supply port 61-1 of a NOT device 61 consisting of a pure fluidic device. The pressure switch 59 is provided between a motor (not shown) for driving the pump 11 and power source terminals 75a and 75b. For the information means 74, a lamp which is lighted during the fuel supplying operation and a buzzer issuing an alarm may be used.

The output port 61-3 of the NOT device 61 is connected to an air pilot 40a of the changeover valve 40. The output port 57-3 of the OR device 57 is connected to the control port 55-3 of the flip-flop device 55. The outputport 56-4 of the flip-flop device 56 is'connected through an air pipe 66 to the input port 57-2 of the QR device 57 and through an air pipe 67 to reset signal input ports 62a and 63a of preset counters 62 and 63. The output port 56-5 of the device 56 is connected to an inlet side 65a of an open-close valve 65 in an air pulse signal emission part 64 provided in the way of an air pipe 68 and also connected through an air pipe 69 to air pressure supply ports 62b and 63b of the preset counters 62 and 63.

An outlet side 65b of the open-close valve 65 is connected to an air pulse signal input port 620 of the-preset counter 62 and to a supply port 70-] of a NOT device 70 consisting of a pure fluidic device. The output port 70-3 of the NOT device 70 is connected to an air pulse signal input port 630 of the preset counter 63. A fixed signal emission port 62d of the preset counter 62 is connected to the control port 56-3 of the flip-flop device 56. A fixed quantity signal emission port 63d of the preset counter 63 is connected to the control ports 61-2 and 70-2 of the NOT devices 61 and 70. The actual constructions-of the preset, counters 62 and 63 are described later.

The rotation of the flowmeter 12 during its measuring is transmitted to a rotary cam 72 in the air pulse signal emission part 64 through a rotation transmission means 71 including a reduction gear train. The result of the above-mentioned measuring is indicated on a totalizer 73. The open-close valve 65 repeats its opening and closing by rotations of the cam 72 so that the pipe 68 is repeatedly communicated and non-communicated whereby a train of air pulse signals is generated. Accordingly, the air pulse signals obtained from the outlet side 65b of the open-close valve 65 are proportioned to the flow quantity of the liquid measured by the flowmeter 12. For the air pulse signal emissionpart 64, an air pulse signal emission part consisting of a rotary disk with holes, an air injection pipe and a pressure receiving pipe may be used in substitution for the above described construction. In this instance, the rotary disk is rotated in response to the flow quantity of the liquid and the pressure receiving pipe receives the air injected from the air injection pipe through the hole of the rotary disk thereby generating the air pulse signals.

An operating part 76 of the air operating stop valve 13 is supplied a control air pressure through an air pipe 77 from the operation control part 47. The displacement of the piston or the diaphragm in the operating part 76 is controlled by the control air pressure whereby the opening of the stop valve 13 is controlled.

' With reference to F IG. 3, the construction of an embodiment of the preset counter 62 (or '63) is now described. The preset counters 62 and 63 are the same in construction.

Operating parts 100, 101 and 102 fixed in a chassis frame are respectively provided with flexible diaphragms or bellows in tension in the interior thereof. The operating part is provided with flexible diaphragms 103, 104 and 105 respectively in tension therein whereby partitioned chambers 106, 107, 108 and 109 are formed in the operating part 100. The

' chamber 107 is provided with shield plates 112 nd 1 13 having respectively hole of an opening area d. The chamber 107 is further divided into three chambers 107a, 1071; and 1070. The flexible diaphragms 103 and 104 are connected by a connecting rod 114 passing through the shield plates 112 and 113. The chamber 108 is provided with a shield plate 115 which has a protruded seat and a hole at the center thereof. The chamber 108 is divided into chambers 108a and l08b by the plate 115. The chambers 106, 107a and 1084 are respectively connected through air pipes 111 and to the air pressure supply port 62b (63b). The chamber 107b is connected to the fixed quantity signal emission port 62d (63d). The chambers 107:: and 1118b are opened to the atmosphere. The chamber 109 is connected through an air pipe 116 to a pressure receiving pipe 118 of a fixed quantity signal emission part 117.

i In the fixed quantity signal emission part 117, an air ejection pipe 119 is provided opposite to the pressure receiving pipe 118. The ejection pipe 119 is connected to an air pipe 120 diverged from the pipe 110. A shield plate 121 is slidably provided to shield between the ejection pipe 119 and the pressure receiving pipe 118.

The operating part 101 has a flexible diaphragm 122 in tension thereby forming partition chambers 123 and 124 therein. The chamber 123 is connected to the reset signal input port 62a (63a). An output shaft 125 secured to the diaphragm 122 at one end is fixed at a reset lever 126 at the other end. Also, the operating part 102 has a flexible diaphragm 127 in tension thereby forming partition chambers 128 and 129 therein. An output shaft 130 secured to the diaphragm 127 is fixed at a lever 13] at the other end.

A counting wheel 132 is carried on a shaft 133. Here, the counting wheels are provided in the number equivalent to the number of places of the counter. For example, if the counter has four places the counting wheels may be provided four in the number. Only the counting wheel used for the lowest place is shown in the figure. A ratchet wheel 134 and a heart cam 135 for zero resetting are rotatably carried on the same shaft. A lever 131 is provided swingably about a shaft 136. A spring 137 is provided in tension between a side of the lever 131 and the frame. The spring 137 imparts a counterclockwise revolution to the lever 131. The lever 131 has a pawl 131a which meshes with the ratchet wheel 134 and revolves the counting wheel 132.

A setting wheel 138 is rotatably carried on a shaft 139 and meshed with the counting wheel 132. The setting wheels are provided in the same number as the counting wheels. A setting cam 140 is provided integrally with the setting wheel 138. When the setting wheel 138 is rotated to set up a liquid quantity to be supplied, the setting cam 140 rotates integrally with the setting wheel 138. The setting cam 140 has a cam groove 141.

A signal emitting lever 142 is swingably carried on a shaft 143. The above mentioned shield plate 121 is provided at one end of the signal emitting lever 142. A pin 144 is provided on the other end of the signal emitting lever 142. A spring 145 is provided in tension between the frame and the signal emitting lever 142 to impart a clockwide rotating force to the lever 142. A locking lever 146 is provided rotatably on a shaft 147. A spring 148 is provided in tension between the frame and the locking lever 146 to impart a counterclockwise rotating force to the lever 146. A pawl 149 for engaging with the pin 144 is formed at the forward end of the locking lever 146. A lever 151 having a signal emitting roller 150 rotatably at the forward end is formed integrally with the lever 146. The signal emitting roller 150 is always pressed against the peripheral surface of the setting cam 140 by force of the spring 148.

The reset lever 126, a pushing arm 152 and a pinion support arm 153 are integrally and rotatably provided on the coaxial shaft 154. A pushing part 155 for pushing up the pin 144 is formed at one end of the reset lever 126. The other end of the reset lever 126 is formed into a lever support 156. A spring 157 is tensioned between the frame and the reset leverl26 to impart a counterclockwise rotating force to the lever 126. The pushing arm 152 can hits the heart cam 135 at the time of resetting and revolve the cam to therebyreturn the counting wheel 132 to zero. The pinion support arm 153 is provided with a pinion 158 for moving the place by steps at the forward end thereof.

A lever 159 having a pin 161 is rotatably provided on a shaft 160. The lever 159 is supported by the lever support 156 of the lever 126 through the pin 161. When a manually operating reset button 162 is pushed to the leftward in the figure, a push member 163 provided at the forward end of they button 162 pushes the contact portion 164 of the lever 159, whereby the lever 159 is rotated counterclockwise. By rotation of the lever 159, the reset lever 126, the pushing arm 152 and the pinion support arm 153 are integrally rotated clockwise through the pin 161.

Descriptions are now made on the operations of the above mentioned construction which has been illustrated with reference to FlGS.2 and 3. Before starting of the liquid supplying operation, the start operating valve 20 and the stop operating valve 21 are not yet operated but closed. Compressed air fed from the compressed air source 34 is supplied, through the pipe 35, the pressure regulating valve 36, the pipe 38, the pressure regulating valve 48 and the pipes 49 and 54, to the supply port 56-1 of the flip-flop device 56. An output of the flip-flop device 56 appears at the output port 56-4. The output air pressure signal from the output port 564 is supplied to the input port 57-2 of the OR device 57 and the reset signal input ports 62a and 63a of the preset counters 62 and 63.

In the OR device 57, the input compressed air signal supplied to the input port 57-2 is taken out as an output from the output port 57-3. The output of the OR device 57 is supplied to the control port 55-3 of the flip-flop device 55. Therefore, the compressed air supplied to the supply port 55-1 of the flip-flop device 55 through the pipe 52 is discharged into the atmosphere from the output port 55-4 or interrupted. The output does not appear at the output port 55-5. The air signal is not supplied to the components connected to the pipes 58 and 60. The changeover valves 39 and 40 are thus closed. The compressed airs supplied through the pipe 37 to the changeover valves 39 and 40 are interrupted by the valves 39 and 40. The pressure switch 59 is opened and the motor for driving the pump 11 is not started its operation. Since the control part 47 is not supplied signal pressure through the pipe 46, the operating part 76 is not supplied a signal. The stop valve 13 is therefore closed.

As hereinabove described, the preset counters 62 and 63 are supplied the compressed airs to the reset signal input ports 62a and 63a. The preset counters 62 and 63 are then reset. This condition will be described with reference to F103. The chamber 123 of the operating part 101 is supplied the compressed air from the reset signal input port 62a and the diaphragm 122 is then displaced upwardly in the figure. As the output shaft is displaced upwardly, the reset lever 126 rotates clockwise about the shaft 154 against the force of the spring 157. The pushing arm 152 also rotates integrally with the lever 126 and hits the heart cam thereby revolving the counting wheel 132 to return to nnnn s.

. operation, the signal emitting roller 150 which has been engaged with the cam groove 141 of the setting cam 140 is disengaged from the cam groove 141 by rotations of the counting wheel 132 and setting wheel 138 returning to zero and mounts on the peripheral surface of the cam 140. Thus, the locking lever 146 rotates counterclockwise against the force of the spring 148.

By rotation of the reset lever 126, the signal emitting lever 142 which has been separated from the pawl 149 by preceding emission of a fixed quantity signal is pushed by the pushing portion 155 of the lever 126 and rotated counterclockwise. Accordingly, by rotation. of the levers 142 and 146, the pin 144 is engaged with the pawl 149. By counterclockwise rotation of the signal emission lever 142, the shield plate 121 shields between the ejection pipe 119 and the pressure receiving pipe 118. Prior to the fuel supplying operation of the fixed quantity, the setting wheels (138) of the preset counter 63 for the first stage fixed quantity signal emission are revolved to set up, for example 1.8 K1 and the setting wheels (138) of'the preset counter 62 for the second stage signal emission are revolved to set up 2.0 Kl.

At the starting of fuel supply, the start operating valve 20 is opened. The compressed air from the pipe 51 is supplied respectively to the control ports 55-2 and 56-2 of the flip-flop devices 55 and 56. Therefore, the outputs of the compressed air supplied from the pipes 52 and 54.to the supply ports 55-1 and 56-1 are changed over from the output ports 55-4 and 56-4 to the output ports 55-5 and 56-5.

The output taken out of the output port 55-5 of the flip-flop device 55 is supplied to the supply port 61-1 of the NOT device 61 and appears at the output port 61-3 as an output. The output of the output port 61-3 is supplied to the air pilot 40a whereby the changeover valve is opened. The output of the device 55 is supplied to the air pilot 39a and the changeover valve 39 is opened. By openings of the changeover valves 39 and 40, the compressed airs fed through the pipe 37 are supplied to the input ports 45-1 and 45-2 of the OR device 45 through the pressure regulating valves 43 and 44. The setting pressures of the pressure regulating valves 43 and 44 are respectively at 0.3 Kg/cm and at 1.0 Kg/cmJ Accordingly, only the compressed air of 1.0 Kg/cm appears at the output port 45-3 of the OR device 45 and is supplied to the control part 47 through the pipe 46.

The control part 47 adjusts the air pressure supplied from the pipe 50 by using the air pressure supplied from the OR device 45 as a pilot pressure. The control part 47 delivers a large controlled air pressure corresponding to 1.0 Kg/cm through the pipe 77 to the operating part 76. Therefore, the piston or diaphragm in the operating part 76 is largely displaced so that the stop-valve 13 is fully opened. Also, at the same time, the outputof the flip-flop device 55 is supplied to the information means 74 and the pressure switch 59. The information means 74 indicates the fuel supplying operation being performed by, for example, lighting of a lamp. Also, by closingof the pressure switch 59, the motor fordriving the pump 11 is applied an electric power and the pump 11 starts delivery of a liquid of the pipe 10.

On the other hand, the output taken out of the output-port 56-5 of the flip-flop device 56 is supplied to the air pressure supply ports 62b and 63b of the preset counters 62 and 63 and the open-close valve 65. In the preset counter 62, the compressed air supplied. to the air pressure supply port 62b is ejected in beam form from the ejection pipe 121. The ejected air is interrupted by the shield plate. 121 and does not reach the' pressure receiving pipe 118. The compressed air from the air pressure supply port 62b is supplied to the chambers 106, 107 and 108. In the chamber 106, the diaphragm 103 is displaced to the rightward inthe figure by the supplied air pressure. The compressed air supplied to the chambers 107 and 108 is discharged into the atmosphere.

As described above, when the pump 11 is operated and the stop valve 13 is opened, theliquid in the'pipe 10 is supplied to the tank lorry through the pump 11, the strainer 30, the flowmeter 12, the stop valve 13 and the manually operating valve 31. Change of the flow quantity of the liquid by time is shown in F164. A liquid supply starts to flow from the time T And in a short period until it reaches a time T the flow quantity attains a maximum flow quantity Q Thereafter, the liquid supply is carried out by the flow quantity 0,. At this instant, the flow quantity of the liquid through the pipe 10 is measured by the flowmeter 12. By this measuring, the cam 72 is rotated and the open-close valve 65 is opened or closed allowing the air pulse signals to be emitted from the air pulse signal emission part 64 corresponding to the flow quantity of the liquid.

Intermittent air pulse signals emitted from the signal emission part 64 are supplied to the pulse signal input port 620 of the preset counter 62 and to the pulse signal input port 630 of the preset counter 63 through the NOT device 70. In the preset counter 62, the air signal supplied from the pulse signal input port 620 is supplied to the chamber 128 of the operating part 102. The diaphragm 127 is displaced upwardly in the figure. Thus, the output shaft is displaced upwardly and the lever 131 rotates clockwise against force of the spring 137. When the first air pulse signaldisappears, the compressed air in the chamber 128 is discharged through the input port 62c from the exhaust port of the open-close valve 65 into the atmosphere. Following this, the diaphragm 127 receives the force of the spring 137 through the lever 131 and the output shaft 130 and is displaced downwardly in the figure. By counterclockwise swing of the lever 131, the pawl 131a rotates counterclockwise and the ratchet 134 is allowed to rotate in one step together with the counting wheel 132. The indicated value of the counting wheel 132 advances from 0 to 1. Then, the value in the lowest place of the preset value of the setting up wheel 138 is reduced by one in the value.

Associated with the rotation of the cam 72, a second air pulse is emitted from the open-close valve 65, whereupon the lever 131'performs its clockwise rotation and subsequent counterclockwise rotation by similar action as above described. Accordingly, the counting wheel 132 rotates in one step together with the ratchet wheel 134. The indicated value of the counting wheel 132 advances in one step from 1 to 2. Then, the indicated value of the setting wheel 138 is reduced by one in the value.

Similarly as in the above, the air pulses are emitted from the signal emission part 64 in response to the flow quantity of a liquid flowing through the pipe and the lever 131 swings. Therefore, the counting wheel 132 consecutively integrates and indicates the measured amounts. The setting wheel 138 consecutively subtracts the set value and indicates the subtracted value. The same action is made in the preset counter 63 as in the above described preset counter 62.

As the fuel supply advances and the quantity of supplied fuel reaches the value 1.8 Kl set in the preset counter 63 for the first stage fixed quantity signal emission, the grooves 141 of the setting cams 140 in each place are aligned in one line. At this instant, the signal emission rollers 150 corresponding to setting cams 140 are all simultaneously fitted in the cam grooves 141. Thereby, the locking lever 146 is rotated clockwise by the force of the spring 148. The pawl 149 which has been engaged with the pin 144 is released from the engagement of the pin 144. The signal emission lever 142 rotates clockwise by force of the spring 145 and the pin 144 contacts the pushing portion 155.

By clockwise rotation of the lever 142, the shield plate 121 is raised upwardly in the figure. Therefore, the shield between the ejection pipe 119 and the pressure receiving pipe 118 is removed. Then, the compressed air ejected from the ejection pipe 119. is received by the pressure receiving pipe 118 and supplied to the chamber 109 of the operating part 100. The diaphragm 105 is displaced to the leftward in the figure by this compressed air. The thus displaced diaphragm 105 shields the protruded seat of the shield plate 115 and thereby the internal air pressure of the chamber 108a is increased.

It is assumed 'now that the total area of the diaphragms 103 and 104 is S and the force displacing the diaphragm 103 to the rightward in the figure by an air pressure P applied in the chamber 106 is F,. Then, the following formula is obtained.

F S X P 1 It is assumed that the operating area of the shield plate 112 in the chamber 107 is given as d and the force to displace the diaphragm 103 to the rightward in the figure is F The following formula is obtained.

F,=(sd) P Therefore, the force F exerted on the diaphragm 103 as a whole is expressed by the following formula;

On the other hand, if the force for displacing the.

diaphragm 104 to the leftward in the figure is given as F, and the pressure exerted in the chamber 108 is P', the formula is obtained as follows.

F4 S X P (4) Provided that the pressure P is slightly lower than the pressure P but substantially P e (s) the force F applied on the connecting rod 114 can be obtained from the above formulas (3), (4) and (5) as follows.

From the formula (6), it results that the diaphragms 1'03 and 104 integrated with the connecting rod 114 are displaced to the leftward in the figure.

By the leftward displacement of the diaphragm 104, the hole of the shield plate 113 is shielded and the air pressure of the chamber 107 is not discharged from the chamber 107c into the atmosphere. Therefore, the air pressure in the chamber 107b rapidly rises. The compressed air in the chamber '107b is discharged from the fixed quantity signal emission port 63d. Thus, the first stage fixed quantity signal is emitted from the signal emission port 63d. When this first stage fixed quantity signal is supplied to the control port 61-2 of the NOT device 61 as the control signal, the supply pressure to I Kg/cm" supplied to the input port -1 of the OR device 45 appears at the output port 45-3. The control part 47 is supplied the air pressure 0.3 Kg/cm through the pipe 46. The air pressure applied to the control part 47 is reduced from 1.0 [(g/cm to 0.3 Kglcm whereby the operating part 76 reduces the valve opening of the stop valve 13 and the first stage valve closing of the valve 13 is performed.

The variation of flow quantity at this instant is shown in FIG. 4. At the time T the first stage fixed quantity signal'is emitted and the valve 13 is throttled, then the flow quantity per unit time decreases in a short period of time. At the time T the flow quantity becomes Q thereafter, the liquid is continuously supplied in the small flow quantity Q As the liquid supply advances and the supplied quantity of the liquid reaches the quantity of 2.0 Kl set up in the preset counter 62 for the second stage fixed quantity signal emission, the cam grooves14l of the setting cams of each place are aligned in one line. At this instant, the second stage fixed signal is emitted from the fixed quantity signal emission port 62d in the same manner as in the first stage fixed quantity signal emis- S1011.

The second stage fixed quantity signal is supplied to the control port 56-3 of the flip-flop device 56. Since the control port 56-2 is not supplied the control pressure, the output of the device 56 is then switched over from the output port 56-5 to the output port 56-4. The output of the output port 56-4 is supplied to the input port 57-2 of the OR device 57 and the reset signal input ports 62a and 63aof the preset counters 62 and 63, respectively.

As the input is applied on the input port 57-2 of the OR device 57, an output appears at the output port 57-3. The output is supplied to the control port 55-3 of the flip-flop device 55 as the control signal. The output of the device 55 is changed over from the output port 55-5 to the output port 55-4. Accordingly, the output does not appear at the output port 55-5. The supplies of air pressure to the supply port 61-1 of the NOT device 61, the air pilot 39a of the changeover valve 39,

the information means 74 and the pressure switch 59 are thereby'stopped.

- Thus, the changeover valve 39 is closed to stop the supply of the air of. pressure 0.3 Kg/cm to the OR device 45. The pilot pressure supplied to the control part-47 turns to zero and the stop valve 13 is fully closed. A second stage value closing is then performed. As shown in FIG. 4, this second stage fixed quantity signal is emitted at the time T and thereafter in a very short time the flow quantity turns to zero at the time T This results that the supply of the fixed quantity of 2 Kl in total has been finished. Therefore, the information means 74 becomes inoperative. The pressure switch 59 is opened and the power source circuit of the motor for driving the pump 11 is opened. The-pump 11 becomes inoperative and stops the liquid delivery through the pipe 10.

When the output of the flip-flop device 56 is changed over from the output port 56-5 to the output port 56-4, the supply of the air pressure to the preset counters 62 and 63 is stopped. The pressure air in the chambers 106, 107, 108 and 109 of the operating part 100 is discharged from the ejection pipe 119 and other holes and ports connecting to the'atmosphere and returned to thecondition before starting of operation. When the reset signals are respectively supplied to the reset signal input'ports 62a and 63a, the pressure in the chamber 123 of the operating part 101 rises. The diaphragm 122 and the output shaft 125 are displaced upwardly and the reset lever 126 swings clockwise. The pushing'arm 152 rotates integrally with the lever 126 and hits the heart cam 135. The counting wheel 132 is then returned to zero. The reset button 162 also return the counting wheel 132 to zero. The pushing member 155 raises the pin 144 and engages it with the pawl 149, whereby the signal emitting lever 142 is again held in condition as shown in FIG. 3. The shield plate 121 again shields between the ejection pipe 119 and the pressure receiving pipe 118.

The above described embodiment is mainly concerned with the fuel supplying operation of the liquid quantity 2 Kl. The quantity of the liquid to be supplied can be preferably selected by adequately setting up the setting-wheel 138 of the preset counters 62 and 63. The quantity of the liquid to be supplied at the time of emission of the first stage fixed quantity signal is determined depending on the factors of the flow quantity per unit time, aperture of the pipe and precision requirement etc.

When emergency troubles such as a firing, an accident in the liquid supplying system and overflowing of the liquid from the container arise in the liquid supplying operation, the emergency stop operating valve 21 may be operated. By opening of the valve 21, the air pressure is supplied to the input port 57-1 of the OR device 57. The output of the output port 57-3 of the device 57 is supplied to the control port 55-3 of the flip-flop device 55. The output of the device 55 is then i changed from the output port 55-5 'to the output port 55-4. Accordingly, the stop valve 13 is fully closed by similar action as the second stage fixed quantity signal is emitted from the preset counter 62. The pump -11 then becomes non-operative. However, the values indicated on the preset counters 62 and 63 are not returned to zero. Therefore, it is possible to continue 12 the measuring of remaining liquid after such emergency stop.

The apparatus of the above described embodiment performs thetwo stage valve closing. A second-embodi- -ment for performing only one stage valve closing is shown in FIG. 5.1The apparatus shown in FIG. 5 is identical with that shown in FIG. 2 exceptthat the former apparatus has no first stage fixed quantity signal emission system. In the figure, identical partsare demoted by the same numerals, the detailed description thereof is therefore omitted.

, In this embodiment, the output port 55-5 of the flipflop device 55 is connected through an air pipe to the air pilot 40a of the changeover valve 40, the information means 74 and the pressure switch 59. The output side 40c of the changeover valve 40 is connected through an air pipe 181 to the operating part 76 of the stop valve 13. Other parts are identical with the parts of the apparatus of FIG. 2 in which the preset counter .63,

the NOT device 70, the changeover valve 39, the pres.-

sureregulating valves 43 and 44, the OR device 45, the NOT device 61, the control part 47 and the accompanying air pipes are removed. Operation of the apparatus is almost identical with the above embodiment so that the detailed description thereof is omitted.

A third embodiment of the apparatus according to this invention will now be described with reference to FIG. 6.

The compressed air from the compressed air source 34 is supplied, through the air pipe 35 and the pressure regulating valve 36 to the air pipes 37 and 38. The pipe 37 is on the way provided with an air supply valve 200 and a pressure reducing valve 201. The pipe 38 is connected to a positioner- 202 of the stop valve 13. The pipe 37 is diverged into air pipes 203, 204, 205, 206, 207, 208 and 209.

The pipe 203 is connected to a supply port 210-1 of an AND device 210. The pipe 204 is provided on the way with the start operating valve 20 and connected to a set port 211-2 of a flip-flop device 211. The pipe 205 is connected to the supply port 211-l of the flip-flop device 211. The pipe 206 is provided on the way with the emergency stop operating valve 21 and is connected to an OR device 212 of an OR circuit 214 which consists of OR devices 212'and 213. The pipe 207 is provided on the way with an one-shot multivibrator device 215 and is connected to the OR device 213. The pipe 208 is provided on the way with a NOT device 216 and a second stage changeover valve 217 and is connected to the OR device 212. The pipe 209 is provided on the way with a first stage changeover valve 218 and is connected to a supply port 219-1 of an AND device 219. The changeover valves 218 and 217 for the first and second stage operations constitute a part of the preset counter actuated by the flowrneter 12 as later described.

An air pipe 220 diverged from the pipe 209 is con nected to the control port 216-2 of the NOT device 216. The output port of the OR device 213 is connected through an air pipe 221 to the reset 'port 211-3 of the flip-flop device 211. The output port 211-4 of the flip-flop device 211 is connected through air pipes 222 and 223 respectively to the control ports 210-2 and 219-2 of the AND devices 210 and 219. The output ports 210-3 and 219-3 of the AND devices 210 and 219 are respectively connected through air pipes 224 and 225 to input ports 226-1 and 226-2 of an OR device 226.

A pressure reducing valve 227 is provided on the way of the pipe 224 and reduces the air pressure to 0.3 Kg/cm. The air pressure supplied from the pipe 224 to the input port 226-1 of the OR device 226 is 0.3 Kg/cm and the air pressure supplied from the pipe 225 to the input port 226-2 is 1.0 Kg/cm The output port 226-3 of the OR device 226 is connected to the positioner 202 and a pressure gauge 228.

In the present embodiment, the above described flipflop device 211, OR devices 212 and 213, one-shot multivibrator device 215, NOT device 216, AND devices 210 and 219 and OR device 226 are all consisted of pure fluidic devices. Also, moving type fluidic devices may be used in substitution for the pure fluidic devices.

Operation of the apparatus having the above construction will be described below. Before starting of the liquid supply, the compressed air in the pipe 37 is interrupted by the air supply valve 200 which is closed. The positioner 202 receives no input from the OR device 226 and is inoperative. Therefore, the stop valve 13 is closed. The preset counter mechanism is reset and the first stage changeover valve 218 is opened.

At the start of the liquid supply, the air supply valve 200 is operated to open. The air passed through the valve 200 is reduced its pressure to l Kg/cm by the pressure reducing valve 201 and thereafter supplied to the pipes 203-209. As the valves 20 and 21 are closed, the compressed air does not pass therethrough. The changeover valve 218 is opened so that the compressed air passing through the valve 218 is supplied to the AND device 219 and the NOT device 216. Since the control signal is supplied to the control port 216-2 of the NOT device 216, the compressed air supplied to the supply port 216-1 does not appear at the output port 216-3.

The OR circuit 214 is supplied only one-shot signal of the one-shot multivibrator device 215. The output signal of the OR circuit 214 is supplied to the reset port 211-3 of the flip-flop device 211. The flip-flop device 211 is then reset. The air supplied through the pipe'205 to the supply port 211-1 is discharged from the output port 211-5 into the atmosphere and the output will not appear at the output port 211-4. The AND devices 210 and 219 are not supplied the control signal from the flip-flop device 211 respectively to the control ports 210-2 and 219-2. The output ports 210-3 and 219-3 have no output. Thus, the positioner 202 does not change and the stop valve 13 is still maintained to be closed.

Upon starting of the fuel supply, the start operating valve is actuated and opened. The air passed through the valve 20 is supplied to the set port 211-2 of the flip-flop device 211. The flip-flop device 21 1 is then set up and the output of the device 211 appears at the output port 211-4. The output of the device 211 is supplied to the control ports 2102 and 219-2 of the AND devices 210 and 219. If the button of the start operating valve 20 is depressed and the valve is closed, the flopflop device 211 retains its condition in which the output appears at the output port 211-4.

Since, at this instant, the compressed air is still supplied to the supply port 210-1 of the AND device 210 as described above, an output appears at the output port 210-3 when the control signal is supplied to the control port 210-2. The output air pressure of the AND device 210 is reduced to 0.3 Kg/cm by the pressure reducing valve 227 and thereafter supplied to the input port 226-1 of the OR device 226. On the other hand, the supply port 219-1 of the AND device 219 has been supplied the compressed air as described above so that, when the control signal is supplied to the control port 219-2, an output appears at the output port 219-3. The output signal of the output port 219-3 is the air under pressure 1.0 Kg/cm. This output signal is directly supplied to the input port 226-2 of the OR device 226.

The OR device 226 which is supplied the output of the AND devices 210 and 219 allows to pass therethrough the air of larger pressure i.e., the air of pressure 1 Kg/cm supplied from the AND device 219. The positioner 202 is supplied the air of pressure 1 Kg/cm from the OR device 226 and operates to entire- 4 1y open the stop valve 13. Also, the pressure gauge 228 is supplied the air pressure from the OR device 226 and indicates the pressure 1 Kg/cm By full opening of the stop valve 13, the liquid flows through the pipe 10 for supply. The flowmeter 12 measures the amount of the supplied liquid. The first stage changeover valve 218 and the second stage changeover valve 217 are actuated in response to the operation of the flowmeter 12 as later described. During the period from the start of fuel supply to the first stage valve closing, the changeover valve 218 is held to be opened. The changeover valve 217 repeats its opening and closing as later described. However, as the output of the NOT device 216 is zero, the valve 217 does not affect the OR circuit 214.

As the fuel supply advances in the state that the valve 13 is fully opened, the quantity of the supplied liquid then reaches the quantity for the first stage valve closing. In case of this embodiment, it is provided that the liquid supply is made in a fixed quantity of 400 1. And when the quantity of supply reaches 399.5 l, the first stage valve closing must be accomplished. When the quantity of the supplied liquid reaches 399.5 1, the first stage changeover valve 218 is closed by the later described action.

By closing of the valve 218, the supply of air to the NOT device 216 and the AND device 219 is interrupted. When the NOT device 216 is no more supplied 1 the control signal to the control port 216-2, the output appears at the output port 2163. However, as the changeover valve 217 is closed at this instant, the output of the NOT device 216 is not supplied to the OR circuit 214. Also, since the air is not supplied to the supply port 219-1 of the AND device 219, the output'is not generated at the output port 219-3. Therefore, the OR device 226 is supplied only the air pressure 0.3 Kg/cm which has passed through the pressure reducing valve 227. Then, the pressure of the air signal supplied to the positioner 202 is changed from 1 Kg/cm to 0.3 Kg/cm. The valve 13 is greately closed and the first stage valve closing is performed. Accordingly, the flow path of the pipe'l0 is greatly throttled to allow a small quantity of the liquid to flow continuously. The pressure gauge 228 then indicates the pressure 0.3 Kglcm "mm: nan-r Next, when the liquid supply in small quantity advances after the first stage valve closing and the sum of integrated quantity of the supplied liquid has reached 400 l, the second stage changeover valve 217 is opened by the later described operation. By opening of the changeover valve 217, the air is supplied from the NOT device 2l6 to the OR circuit 214. Thus, the output compressed air of the OR circuit 214 is supplied to the reset port 21 1-3 of the flip-flop device 211. Therefore, the device 211 is reset and the air supplied to the supply port 211-1 is again discharged into the atmosphere. There is no output at the output port 211-4.

The control port 210-2 of the AND device 210 is not supplied the control signal-and the output port 210-3 does not produce the output. There are no input and output at the OR device 226. The air signal pressure to the positioner 202 turns to zero. The stop valve 13 is instantly fully closed. Then, the pressure gauge 228 indicates Kglcm The second stage valve closing is accomplished and the fixed quantity fuel supply of 400 l is completed.

When a trouble arises during the fuel supply and it is required to stop the fuel supply, a push button of the emergency stop valve 21 may bedepressed so as'to open the valve. By opening of the valve 21, the compressed air is supplied through the valve 21 to the OR device 212 in the OR circuit 214-and the OR device the fuel supply is reopened. The preset counter starts its action again from its suspended condition so that the supply of remaining liquid is continuously performed. Furthermore, if the fuel supply is started over again, the preset counter may be reset and thereafter the start operating valve 20 is opened.

An embodiment of the preset counter for actuating the first stage changeover valve 218 and the second stage changeover valve 217 is described hereinbelow with reference to FIGS. 7 and 8.

Upon setting up the liquid supply quantity, an engaging rod 250 isrotated to release the engagement with the clamper 251 as shown in FIG. 8. When a setting knob 252 is rotated,-a pinion gear 253 is rotated so that a sector gear 254 is swung to right and left. A movable lever 255 is swung together with the sector gear 254, whereby a roller 256 is moved to right and left on a displacing shaft 257.

Cam part 258 consists of an index ring 259 and ten circular cams 260. Indicated on the outer periphery of the index ring 259 are numbers of 0 to 9. The circular cams 260 are respectively provided so as to coaxially and integrally rotate with the index ring 259 and have respectively notches 261 in positions corresponding to the respective indices thereof. By'setting of rotation of the above described knob 252, the roller 256 reaches a position opposite to the cam 260 responsive to the set value. The displacing shaft257 receives the force of a spring 263 through a lever 262. The roller 256 fitted to 16 the displacing shaft 257 always receives a force pressing against the cam 260. Number of sets of the setting part including the cam part 258, the roller 25 6 and the setting knob 252 correspondsto the number of the places of the fixed quantity. In this embodiment, there are four sets of setting parts. A zero resetting can be made by pushing a zero return lever 265 to a heart cam 264 provided on the side of the index ring 259.

FIG. 7 diagrammatically shows cams 260 of respective places and their associated parts. In this embodiment, the set value of the fixed quantity is 400 l. A notch 2610 of a cam 260a of the place of hundred'is in a position correspondingto a numeral 4 on the index ring. 259. A roller 256a is contacting the outer peripheral surface of the cam 260a. Notches 261b and 261:: of cams 260b and 260c of respectively the places of ten and one are respectively in positions corresponding to numeral 0. Rollers 256b and 2560 are in positions opposite to notches 261b and 261c. A notch 261d of a cam 260d of the place of the decimal part is in a position corresponding to a numeral 5". Therefore, the cam 260d is in a position advanced already by 0.5 I before starting of the liquid supply. The roller 256a is then in contact with the outer peripheral surface of the cam 260d. By contacting of the rollers 256a and 256d with the outer peripheral surfaces of the cams 260a and 260d, the displacing shaft 257 is displaced upwardly in FIG.7(downwardly in FIG. 8.). Therefore, the first stage changeover-valve 218 which is opened or closed by displacements of the displacing shaft 257 isnow opened. r

The cams 260b 260d have respectively double teeth 267b 267d cooperating with pinions 266b 266d for taking a figure up one place. Since the cam 260d is in a condition advanced in 0.5 l as described above, the double teeth 267d is advanced in 0.5 I. Integrating counters 268a 268d for integrating the substantial flow quantities are all aligned on zero and show 000.0 (I). On the other hand, an apparent indication on the index ring 259 shown by the cams; 260a 260d is 000.5 (I).

A second stage signal emitting cam 269 for opening or closing the second stage changeover valve 217 has at a part a notch 271 for fitting an actuator.270 of the changeover valve 217. Following the rotation of the cam 269, the actuator 270 repeatedly performs mounting on the outer periphery of the cam 269 and fitting in the notch 271. Thus, the changeover valve 217 repeats opening and closing of the valve. On the rotary shaft of the cam 269, there are provided a setting knob 272, a zero adjusting dial 273 and a gear 278. The rotation of the dial 273 for zero adjustment is not transmitted to the knob 272 side on account of a unidirectional clutch 274. The dial 273 is indexed to zero before the fuel supply is started.

As hereinbefore described with reference to FIG. 6, the start operating valve 20 is now opened and the liquid supply is started, and then the flowmeter 12 is actuated responsive to the flow quantity of the liquid flowing through the pipe 10. The rotation of the flowmeter 12 is transmitted toan input shaft 275. The rotation of the shaft 275 is transmitted through a transmission gear 276 to a gear 277 provided on the rotary shaft of the cam 260d and to a gear 278 provided on the rotary shaft of the cam 269 respectively at the ratio of l 1.

When the liquid of 0.5 l is supplied, the cam260d rotates in one-half rotation (that is, 0.5 l). The rotation of the gear 277 is transmitted through the transmission gear 279 to a gear 280 provided on the shaft of the integrating counter 268d. The integrating counter 268d now indicates (1). The cam 260d has been advanced for 0.5 1 before the liquid supply is started, so that when the liquid is actually supplied in 0.5 l, the double teeth 267d drives the pinion 266d and rotates the cam 260c by one step. Thus, the apparent indication of the index ring 259 is 1.0(1).

With the start of the fuel supply, the cam 269 is transmitted the rotation through the gear 278 and is rotated. The actuator 270 of the changeover valve 217 mounts on the outer periphery of the cam 269 and the changeover valve 217 is closed. The changeover valve 217 repeats the opening and closing in every rotation of the cam 269. However, as the changeover valve 217 is not supplied the compressed air from the NOT device 216, it does not affect the OR circuit 214 as described above. The notch 261d of the cam 260d reaches a position opposite to the roller 256d but the displacing shaft 257 is maintained to be displaced upwardly because the rollers 256a and 256s are respectively contacting the outer periphery of the cams 260a and 2600.

By further advance of the liquid supply, the actual quantity of the supplied liquid reaches 399.5 1 and then the quantity is indicated on the integrating counters 268a 268d. At this instant, an apparent indication of the index rings responsive to the cams 260a 260d is 400 l. The notches 261a 261d of the cams 260a 260d are all positioned in opposite to the rollers 256a 256d. The rollers 256a 256d on the displacing shaft 257 which is biased by the spring 263 all fit into the notches 261a 261d. Therefore, the displacing shaft 257 is displaced downwardly in FIG. 7, whereby an actuator 281 of the changeover valve 218 is depressed to open the valve 218. This results, as referred to FIG.6, the first stage valve closing of the stop valve 13 is performed. At this instant, the actuator 270 of the changeover valve 217 is contacting with the outer periphery of the cam 269 in an diametrally opposite position to the notch 271 of the cam 269. Thus, the valve 217 is closed.

After the first stage valve closing and further supply of the liquid, the actual quantity of the liquid supply reaches 400 lequal to the preset amount. Since the liquid supply of 0.5 l is carried on until the liquid reaches the fixed quantity after the first stage valve closing the cam 260d and the cam 269 make one-half rotation during the above-mentioned period. As the cam 269 makes one-half rotation in this manner, the actuator 270 fits into the notch 271. At this instant, the changeover valve 217 is changed over from closing to opening. Accordingly, as described with reference to holding condition of the holding means is released.

When the second stage valve closing has been performed and the fixed quantity fuel supply is finished, the apparent indication on the index ring is 400.5 l. However, the actual quantity of the supplied liquid is 400 l and the actual quantity is indicated on the integrating counters 268a 268d.

Next, when the fixed quantity liquid supply of 400 l is again performed, the zero return lever 265 impact the heart cam 264 for zero resetting. Then, the cam part 258 in each placeis returned to an initial position just before starting of liquid supply. Thus, in the described manner, the start operating valve '20 is operated so that the fixed quantity liquid supply is again started.

When the quantity of the supplied liquid has an excess amount at the time of the second stage valve closing in the first time liquid supply, the cam 269 stops at a positioned displaced somewhat from a normal stop position in corresponding to the excess amount. Therefore, in the liquid supply of subsequent time, the cam 269 starts its rotation from this displaced position so that the excess amount may be off-set and the liquid supply of correct quantity is performed.

When the liquid supply is urgently stopped during supplying of the liquid and the preset counter must be reset, one may accord the index of the zero adjusting dial 273 with the zero index. Then, the cam 269 returns to the initial condition before starting of the liquid supply.

The invention is not limited to the above described embodiments in practice. The apparatus may have a construction, for example, including a main stop valve provided at the pipe 10 and an auxiliary stop valve provided at the pipe for by-passing the main stop valve. The main stop valve is operated by the output of the AND device 219 and the auxiliary stop valve is operated by the output of the AND device 210. In this case, closing of the main stop valve corresponds to the first stage valve closing and the closing of the auxiliary stop valve corresponds to the second stage valve closing. Also, in the other embodiment, the positioner 202 is not directly operated by the output of the AND devices 219 and 210. In this instant, air pipes having two different pressures for driving the positioner are opened or closed by the output of the AND devices 219 I and 210. In either case, it is not required to provide a pressure reducing valve 227. Other adequate constructions may also be considered if the outputs of the AND devices 219 and 210 are used for multi-stage valve clos- Moreover, it is possible to use any suitable fluid for driving the fluidic devices without limiting it to the air although the air is specifically employed in the above embodiment.

The apparatus according to the invention has many features and advantages as follows:

I. The fixed quantity fuel supply control circuit uses fluidic devices actuated by signals of fluid such as air and the like. Therefore, even if the liquid to be supplied may be inflammable liquid or it is liquid for generating explosive gas, the liquid supply can be safely performed. The circuit does not need explosion proof construction as seen in the conventional circuits which use electrical signals. The construction is thus very simple and its manufacturing cost is low.

and the stop valve opening and closing control circuit are respectively formed indifferent systems. The input signal supplied to the stop valve is always constant without regard to the changeover operation of the fluidic devices.

3. Generally, the fluidic device has a disadvantage that the device greatly consumes the fluid such as air. According to the circuit construction of the present invention, the compressed fluid may be supplied only during measuring of the supplied liquid. Thus, the fluid consumption is greatly economized'. Throughout the abovementioned embodiments, the fluidic devices are used but moving type fluidic devices may likewise be used for pure fluidic devices. This moving type fluidic device can lessen the fluid consumption extremely.

4. It is available to directly use the air operating valve for stopping the fuel supply without using the electromagnetic valve as seen conventionally. There is not required electrical signal air signal conversion means.

What we claim is:

1. A fixed quantity liquid supplying apparatus comprising a conduit pipe for, forming a flow path of a liquid to be supplied, a stop valve provided at theconduit pipe, valve operating means operated by-fluid pressure and for opening or closing the stop valve, a flowmeter provided at the flow path, a compressed .fiuid source, a first stage changeover'valve supplied with the compressed fluid from the compressed fluid source, a NOT fluidic device supplied with the compressed fluid from the compressed fluid source at the input port and supplied with the output fluidicsignal of the first stage changeover valve at the control port, said NOT fluidic device having an output controlled by the fluidic signal at the control port, a second stage changeover valve supplied with the outputfluidic signal from the NOT fluidic device, preset counter means operating in response to the measuring of the flowmeter, said preset counter means closing the first stage changeover valve when the counted flow quantity of the liquid reaches at the first predetermined value and opening the second stage changeover valve when the counted flow quantity of the liquid teaches at the second predetermined value, a start operating valve supplied with the compressed fluid from the compressed fluid source, said start operating valve being opened at the starting of the supplying of the liquid, a FLIP FLOP fluidic device supplied with the compressed fluid from the compressed fluid source at the supply port, said FLIP FLOP fluidic device being further supplied with the output of the start operating valve at the set port and supplied with the output of the second stage changeover valve at the reset port, an AND fluidic device supplied with the outputof the first stage changeover valve at the supply port and supplied with the output of the FLIP FLOP fluidic device at the control port, said valve operating means being operated by the output of said AND fluidic device.

2. A fixed quantity liquid supplying apparatus as defined in claim 1, which further comprises an emergency stop operating valve supplied with the compressed fluid from the compressed fluid source, said emergency stop valve being opened in an emergency, and an OR fluidic device supplied with the outputs of the emergency stop valve and the second stage changeover valve, said OR fluidic device supplying its output to said FLIP FLOP fluidic device.

3. A fixed quantity liquid supplying apparatus comprising a conduit pipe for forming a flow path of a liquid to be supplied, a stop valve provided at the conduit pipe, a valve operating means operated by fluid pressure and for opening or closing the stop valve, a flowmeter provided at the flow path,a preset counter means operating in response to the measuring of the flowmeter and emitting a fluid signal as an output when the quantity of the supplied liquid reaches a previously set fixed quantity, a compressed fluid sourcefor sup- .plying a compressed fluid to the preset countermeans,

and a control fluidic circuit including fluidic devices for controlling the valve operating means in response to the output fluid signal of the preset counter means, said preset counter means comprisinga counter means transmitted rotations of the flowmeter, a first changeover valve cooperating with the counter means and closing before the quantity of the supplied liquid reaches a predetermined set quantity, and a second changeover valve cooperating with the counter means and opening when the quantity of the supplied liquid reaches the fixed quantity, said control fluidic circuit comprising a flip-flop means consisting of fluidic devices, said flip-flop means being supplied a compressed fluid fromthe compressed fluid source and changed over its output in response to a set signal and a reset signal so as to substantially perform a flip-flop action, means for supplying the set signal of the compressed fluid to the flip-flop means at the start of the liquid supply, means for supplying the reset signal of the compressed fluid to the flip-flop means by opening of the second changeover valve, a first AND means consisting of fluidic devices, said first AND means being supplied with the compressed fluid from the compressed fluid source through the first changeover valve and supplied with an output of the flip-flop means as a control signal so as to substantially perform an AND action, and a second 'AND means consisting of fluidic devices, said second AND means being supplied with the compressed fluid from the compressed'fluid'source and supplied with the output of the flip-flop means as a control signal so as to substantially perform an AND action, wherein said stop valve is fully opened by an output of the first AND means said stop valve is closed in the first stage to half close the liquid flow path when the output of the first AND means disappears and only the output of the second AND means remains, and said stop valve is fully closed in the second stage to fully close the liquid flow path when the outputs of the first and second AND means disappear.

4. The fixed quantity liquid supplying apparatus as defined in claim 3, in which said counter means comprises a first cam means having a plurality of cams provided corresponding to places of the quantities of liquid supply, said cams respectively having notches and being transmitted the rotations of the flow-meter and thereby being rotated, and a second cam means consisting of a cam having a notch, said cam being transmitted rotations of the flowmeter and thereby being rotated, said first changeover valve being closed when the notches of all cams of the first cam means are aligned and said second changeover valve being opened when the notch of the cam of the second cam means reaches a predetermined position.

l060ll 0620 

1. A fixed quantity liquid supplying apparatus comprising a conduit pipe for forming a flow path of a liquid to be supplied, a stop valve provided at the conduit pipe, valve operating means operated by fluid pressure and for opening or closing the stop valve, a flowmeter provided at the flow path, a compressed fluid source, a first stage changeover valve supplied with the compressed fluid from the compressed fluid source, a NOT fluidic device supplied with the compressed fluid from the compressed fluid source at the input port and supplied with the output fluidic signal of the first stage changeover valve at the control port, said NOT fluidic device having an output controlled by the fluidic signal at the control port, a second stage changeover valve supplied with the output fluidic signal from the NOT fluidic device, preset counter means operating in response to the measuring of the flowmeter, said preset counter means closing the first stage changeover valve when the counted flow quantity of the liquid reaches at the first predetermined value and opening the second stage changeover valve when the counted flow quantity of the liquid reaches at the second predetermined value, a start operating valve supplied with the compressed fluid from the compressed fluid source, said start operating valve being opened at the starting of the supplying of the liquid, a FLIP FLOP fluidic device supplied with the compressed fluid from the compressed fluid source at the supply port, said FLIP FLOP fluidic device being further supplied with the output of the start operating valve at the set port and supplied with the output of the second stage changeover valve at the reset port, an AND fluidic device supplied with the output of the first stage changeover valve at the supply port and supplied with the output of the FLIP FLOP fluidic device at the control port, said valve operating means being operated by the output of said AND fluidic device.
 2. A fixed quantity liquid supplying apparatus as defined in claim 1, which further comprises an emergency stop operating valve supplied with the compressed fluid from the compressed fluid source, said emergency stop valve being opened in an emergency, and an OR fluidic device supplied with the outputs of the emergency stop valve and the second stage changeover valve, said OR fluidic device supplying its output to said FLIP FLOP fluidic device.
 3. A fixed quantity liquid supplying apparatus comprising a conduit pipe for forming a flow path of a liquid to be supplied, a stop valve provided at the conduit pipe, a valve operating means operated by fluid pressure and for opening or closing the stop valve, a flowmeter provided at the flow path, a preset counter means operating in response to the measuring of the flowmeter and emitting a fluid signal as an output when the quantity of the suppLied liquid reaches a previously set fixed quantity, a compressed fluid source for supplying a compressed fluid to the preset counter means, and a control fluidic circuit including fluidic devices for controlling the valve operating means in response to the output fluid signal of the preset counter means, said preset counter means comprising a counter means transmitted rotations of the flowmeter, a first changeover valve cooperating with the counter means and closing before the quantity of the supplied liquid reaches a predetermined set quantity, and a second changeover valve cooperating with the counter means and opening when the quantity of the supplied liquid reaches the fixed quantity, said control fluidic circuit comprising a flip-flop means consisting of fluidic devices, said flip-flop means being supplied a compressed fluid from the compressed fluid source and changed over its output in response to a set signal and a reset signal so as to substantially perform a flip-flop action, means for supplying the set signal of the compressed fluid to the flip-flop means at the start of the liquid supply, means for supplying the reset signal of the compressed fluid to the flip-flop means by opening of the second changeover valve, a first AND means consisting of fluidic devices, said first AND means being supplied with the compressed fluid from the compressed fluid source through the first changeover valve and supplied with an output of the flip-flop means as a control signal so as to substantially perform an AND action, and a second AND means consisting of fluidic devices, said second AND means being supplied with the compressed fluid from the compressed fluid source and supplied with the output of the flip-flop means as a control signal so as to substantially perform an AND action, wherein said stop valve is fully opened by an output of the first AND means said stop valve is closed in the first stage to half close the liquid flow path when the output of the first AND means disappears and only the output of the second AND means remains, and said stop valve is fully closed in the second stage to fully close the liquid flow path when the outputs of the first and second AND means disappear.
 4. The fixed quantity liquid supplying apparatus as defined in claim 3, in which said counter means comprises a first cam means having a plurality of cams provided corresponding to places of the quantities of liquid supply, said cams respectively having notches and being transmitted the rotations of the flow-meter and thereby being rotated, and a second cam means consisting of a cam having a notch, said cam being transmitted rotations of the flowmeter and thereby being rotated, said first changeover valve being closed when the notches of all cams of the first cam means are aligned and said second changeover valve being opened when the notch of the cam of the second cam means reaches a predetermined position. 